Steller's eider

The males face some stiff competition when it comes to wooing a female. As many as seven males may pursue a single female. They have an elaborate display of "courtship behaviors, including a series of head-turns, shakes and rearing out of the water," according to the Alaska Department of Fish and Game.

Aggression is shown to the other males with moves that include lifting the beak to show a patch of black underneath.

Steller's eider

The males face some stiff competition when it comes to wooing a female. As many as seven males may pursue a single female. They have an elaborate display of "courtship behaviors, including a series of head-turns, shakes and rearing out of the water," according to the Alaska Department of Fish and Game.

Aggression is shown to the other males with moves that include lifting the beak to show a patch of black underneath.